Notes: Eptifibatide is a potent glycoprotein IIb/IIIa antagonist (GPIIb/IIIa; Kd = 120 nM) that inhibits platelet aggregation.{38053,38054} Eptifibatide prevents binding of the adhesion proteins fibrinogen and von Willebrand factor to GPIIb/IIIa on the surface of activated platelets to prevent aggregation and thrombus formation.{38055} It inhibits ADP-induced citrated blood aggregation (IC50 = 0.11-0.22 μg/ml) in vitro and in vivo (IC50 = 52 μg/ml in porcine plasma).{38053,38056} Formulations containing eptifibatide have been used to reduce risk of thrombolysis in myocardial infarction in patients undergoing percutaneous coronary intervention.{38057}